P0IITU03 - Motion in two and three dimensions qns

# P0IITU03 - Motion in two and three dimensions qns - Q41. In...

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QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 Q41. In uniform circular motion of a body (a) the speed is constant but velocity changes (b) both speed and velocity change (c) the speed change but velocity is constant (d) both speed and velocity are constant Q42. In uniform circular motion which of the following does not remain constant (a) speed (b) velocity (c) acceleration (d) angular displacement Q43. For a particle moving in a circular path with uniform speed, when the acceleration is along Y axis, the velocity will be along (a) X - axis (b) Y - axis (c) ( - X) - axis (d) ( - Y) - axis Q44. Which of the following is true for a particle moving in a circle with a uniform speed (a) acceleration is zero (b) acceleration is parallel to velocity (c) acceleration is antiparallel to velocity (d) acceleration is perpendicular to velocity Q45. If the instantaneous acceleration and velocity are at right angles to each other and are both non zero, during the motion (a) velocity (b) does not change with time (c) both velocity and speed do not change with time (d) both velocity and speed change with time Q46. The angular speed of a geostationary satellite is nearly (a) π rad/h (b) π /12 rad/h (c) π /24 rad/h (d) π /720 rad/h Q47. Two satellites are orbiting earth at distances, respectively, 7,000 km and 42,000 km from its centre. Their centripetal accelerations will be in the ratio (a) 6 : 1 (b) 1 : 6 (c) 36 : 1 (d) 1 : 36 Q48. Two satellites of names m 1 and m 2 (m 1 > m 2 ) are revolving around the earth in circular orbits of radii r 1 and r 2 (r 1 > r 2 ). Which of the following statements about their velocity is true (a) v 1 = v 2 (b) v 1 < v 2 (c) v 1 > v 2 (d) v 1 /r 1 = v 2 /r 2 Q49. The ratio of angular speed of earth around sun to the angular speed around its own axis is nearly (a) 365 (b) 1/365 (c) 1/24 (d) 1/12 Q50. All points on a rotating disc have same (a) angular velocity (b) linear velocity (c) linear velocity and angular velocity (d) none of the above Q51. The angle between the vectors A = a 1 x + b 1 y + c 1 z and B = - a 1 x - b 1 y - c 1 z is (a) zero and their magnitudes are equal (b) 90° and their magnitudes are equal (c) 180° and their magnitudes are equal (d) 180° and their magnitudes are unequal Q52. The angle θ between the vector A = y ˆ 2 x ˆ + and its positive direction of x - axis is given by (a) sin θ = 1/2 (b) cos θ = 1/2 (c) sin θ = 1/5 (d) cos θ = 1/5 Q53. Which of the following statements about vectors is false (a) The magnitude of a vector is always a scalar (b) Each component of a vector is always a scalar (c) Two vectors in a plane can add to give a null vector (d) Three vectors not lying in a plane can never add up to give a null vector. Q54.

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## This note was uploaded on 10/05/2011 for the course PHY 203 taught by Professor Grimaldi during the Spring '11 term at St. Mary NE.

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P0IITU03 - Motion in two and three dimensions qns - Q41. In...

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